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Parked vehicles can create a visual screen such that oncoming motorists and crossing pedestrians cannot see each other. One proposed safety countermeasure is parking bans for specific times at high risk locations. The purpose of this study was to investigate the effect of enforcement on motorist compliance with such time-phased parking bans. The study utilized the time-phased alternate side parking regulations in New York City. Enforcement varied from no increase above normally occurring enforcement to two additional enforcement visits per day. The results showed that increased enforcement can lead to improved motorist compliance. However, the timing of the additional visits within the period of prohibited parking is critical. The observed effects developed slowly and extinguished slowly. Recommendations are offered for employing and enforcing time-phased parking bans.